16cbd5570SChris Mason /* 26cbd5570SChris Mason * Copyright (C) 2007 Oracle. All rights reserved. 36cbd5570SChris Mason * 46cbd5570SChris Mason * This program is free software; you can redistribute it and/or 56cbd5570SChris Mason * modify it under the terms of the GNU General Public 66cbd5570SChris Mason * License v2 as published by the Free Software Foundation. 76cbd5570SChris Mason * 86cbd5570SChris Mason * This program is distributed in the hope that it will be useful, 96cbd5570SChris Mason * but WITHOUT ANY WARRANTY; without even the implied warranty of 106cbd5570SChris Mason * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 116cbd5570SChris Mason * General Public License for more details. 126cbd5570SChris Mason * 136cbd5570SChris Mason * You should have received a copy of the GNU General Public 146cbd5570SChris Mason * License along with this program; if not, write to the 156cbd5570SChris Mason * Free Software Foundation, Inc., 59 Temple Place - Suite 330, 166cbd5570SChris Mason * Boston, MA 021110-1307, USA. 176cbd5570SChris Mason */ 186cbd5570SChris Mason 1958176a96SJosef Bacik #include <linux/sched.h> 2058176a96SJosef Bacik #include <linux/slab.h> 2158176a96SJosef Bacik #include <linux/spinlock.h> 2258176a96SJosef Bacik #include <linux/completion.h> 2358176a96SJosef Bacik #include <linux/buffer_head.h> 2458176a96SJosef Bacik #include <linux/kobject.h> 2579da4fa4SJeff Mahoney #include <linux/bug.h> 2629e5be24SJeff Mahoney #include <linux/genhd.h> 271bae3098SDavid Sterba #include <linux/debugfs.h> 2858176a96SJosef Bacik 29bae45de0SChris Mason #include "ctree.h" 30bae45de0SChris Mason #include "disk-io.h" 31bae45de0SChris Mason #include "transaction.h" 32079b72bcSJeff Mahoney #include "sysfs.h" 3329e5be24SJeff Mahoney #include "volumes.h" 34079b72bcSJeff Mahoney 35510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj); 365ac1d209SJeff Mahoney 37510d7360SJeff Mahoney static u64 get_features(struct btrfs_fs_info *fs_info, 38510d7360SJeff Mahoney enum btrfs_feature_set set) 395ac1d209SJeff Mahoney { 40510d7360SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 41510d7360SJeff Mahoney if (set == FEAT_COMPAT) 42510d7360SJeff Mahoney return btrfs_super_compat_flags(disk_super); 43510d7360SJeff Mahoney else if (set == FEAT_COMPAT_RO) 44510d7360SJeff Mahoney return btrfs_super_compat_ro_flags(disk_super); 45510d7360SJeff Mahoney else 46510d7360SJeff Mahoney return btrfs_super_incompat_flags(disk_super); 475ac1d209SJeff Mahoney } 485ac1d209SJeff Mahoney 49ba631941SJeff Mahoney static void set_features(struct btrfs_fs_info *fs_info, 50ba631941SJeff Mahoney enum btrfs_feature_set set, u64 features) 51ba631941SJeff Mahoney { 52ba631941SJeff Mahoney struct btrfs_super_block *disk_super = fs_info->super_copy; 53ba631941SJeff Mahoney if (set == FEAT_COMPAT) 54ba631941SJeff Mahoney btrfs_set_super_compat_flags(disk_super, features); 55ba631941SJeff Mahoney else if (set == FEAT_COMPAT_RO) 56ba631941SJeff Mahoney btrfs_set_super_compat_ro_flags(disk_super, features); 57ba631941SJeff Mahoney else 58ba631941SJeff Mahoney btrfs_set_super_incompat_flags(disk_super, features); 59ba631941SJeff Mahoney } 60ba631941SJeff Mahoney 61ba631941SJeff Mahoney static int can_modify_feature(struct btrfs_feature_attr *fa) 62ba631941SJeff Mahoney { 63ba631941SJeff Mahoney int val = 0; 64ba631941SJeff Mahoney u64 set, clear; 65ba631941SJeff Mahoney switch (fa->feature_set) { 66ba631941SJeff Mahoney case FEAT_COMPAT: 67ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 68ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 69ba631941SJeff Mahoney break; 70ba631941SJeff Mahoney case FEAT_COMPAT_RO: 71ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 72ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 73ba631941SJeff Mahoney break; 74ba631941SJeff Mahoney case FEAT_INCOMPAT: 75ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 76ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 77ba631941SJeff Mahoney break; 78ba631941SJeff Mahoney default: 79cc37bb04SDavid Sterba printk(KERN_WARNING "btrfs: sysfs: unknown feature set %d\n", 80cc37bb04SDavid Sterba fa->feature_set); 81cc37bb04SDavid Sterba return 0; 82ba631941SJeff Mahoney } 83ba631941SJeff Mahoney 84ba631941SJeff Mahoney if (set & fa->feature_bit) 85ba631941SJeff Mahoney val |= 1; 86ba631941SJeff Mahoney if (clear & fa->feature_bit) 87ba631941SJeff Mahoney val |= 2; 88ba631941SJeff Mahoney 89ba631941SJeff Mahoney return val; 90ba631941SJeff Mahoney } 91ba631941SJeff Mahoney 92079b72bcSJeff Mahoney static ssize_t btrfs_feature_attr_show(struct kobject *kobj, 93079b72bcSJeff Mahoney struct kobj_attribute *a, char *buf) 94079b72bcSJeff Mahoney { 95510d7360SJeff Mahoney int val = 0; 96510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 97510d7360SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 98ba631941SJeff Mahoney if (fs_info) { 99510d7360SJeff Mahoney u64 features = get_features(fs_info, fa->feature_set); 100510d7360SJeff Mahoney if (features & fa->feature_bit) 101510d7360SJeff Mahoney val = 1; 102ba631941SJeff Mahoney } else 103ba631941SJeff Mahoney val = can_modify_feature(fa); 104510d7360SJeff Mahoney 105510d7360SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%d\n", val); 106510d7360SJeff Mahoney } 107510d7360SJeff Mahoney 108ba631941SJeff Mahoney static ssize_t btrfs_feature_attr_store(struct kobject *kobj, 109ba631941SJeff Mahoney struct kobj_attribute *a, 110ba631941SJeff Mahoney const char *buf, size_t count) 111ba631941SJeff Mahoney { 112ba631941SJeff Mahoney struct btrfs_fs_info *fs_info; 113ba631941SJeff Mahoney struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a); 114ba631941SJeff Mahoney struct btrfs_trans_handle *trans; 115ba631941SJeff Mahoney u64 features, set, clear; 116ba631941SJeff Mahoney unsigned long val; 117ba631941SJeff Mahoney int ret; 118ba631941SJeff Mahoney 119ba631941SJeff Mahoney fs_info = to_fs_info(kobj); 120ba631941SJeff Mahoney if (!fs_info) 121ba631941SJeff Mahoney return -EPERM; 122ba631941SJeff Mahoney 123ba631941SJeff Mahoney ret = kstrtoul(skip_spaces(buf), 0, &val); 124ba631941SJeff Mahoney if (ret) 125ba631941SJeff Mahoney return ret; 126ba631941SJeff Mahoney 127ba631941SJeff Mahoney if (fa->feature_set == FEAT_COMPAT) { 128ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_SAFE_SET; 129ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR; 130ba631941SJeff Mahoney } else if (fa->feature_set == FEAT_COMPAT_RO) { 131ba631941SJeff Mahoney set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET; 132ba631941SJeff Mahoney clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR; 133ba631941SJeff Mahoney } else { 134ba631941SJeff Mahoney set = BTRFS_FEATURE_INCOMPAT_SAFE_SET; 135ba631941SJeff Mahoney clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR; 136ba631941SJeff Mahoney } 137ba631941SJeff Mahoney 138ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 139ba631941SJeff Mahoney 140ba631941SJeff Mahoney /* Nothing to do */ 141ba631941SJeff Mahoney if ((val && (features & fa->feature_bit)) || 142ba631941SJeff Mahoney (!val && !(features & fa->feature_bit))) 143ba631941SJeff Mahoney return count; 144ba631941SJeff Mahoney 145ba631941SJeff Mahoney if ((val && !(set & fa->feature_bit)) || 146ba631941SJeff Mahoney (!val && !(clear & fa->feature_bit))) { 147ba631941SJeff Mahoney btrfs_info(fs_info, 148ba631941SJeff Mahoney "%sabling feature %s on mounted fs is not supported.", 149ba631941SJeff Mahoney val ? "En" : "Dis", fa->kobj_attr.attr.name); 150ba631941SJeff Mahoney return -EPERM; 151ba631941SJeff Mahoney } 152ba631941SJeff Mahoney 153ba631941SJeff Mahoney btrfs_info(fs_info, "%s %s feature flag", 154ba631941SJeff Mahoney val ? "Setting" : "Clearing", fa->kobj_attr.attr.name); 155ba631941SJeff Mahoney 15643d87fa2SDavid Sterba trans = btrfs_start_transaction(fs_info->fs_root, 0); 157ba631941SJeff Mahoney if (IS_ERR(trans)) 158ba631941SJeff Mahoney return PTR_ERR(trans); 159ba631941SJeff Mahoney 160ba631941SJeff Mahoney spin_lock(&fs_info->super_lock); 161ba631941SJeff Mahoney features = get_features(fs_info, fa->feature_set); 162ba631941SJeff Mahoney if (val) 163ba631941SJeff Mahoney features |= fa->feature_bit; 164ba631941SJeff Mahoney else 165ba631941SJeff Mahoney features &= ~fa->feature_bit; 166ba631941SJeff Mahoney set_features(fs_info, fa->feature_set, features); 167ba631941SJeff Mahoney spin_unlock(&fs_info->super_lock); 168ba631941SJeff Mahoney 169ba631941SJeff Mahoney ret = btrfs_commit_transaction(trans, fs_info->fs_root); 170ba631941SJeff Mahoney if (ret) 171ba631941SJeff Mahoney return ret; 172ba631941SJeff Mahoney 173ba631941SJeff Mahoney return count; 174ba631941SJeff Mahoney } 175ba631941SJeff Mahoney 176510d7360SJeff Mahoney static umode_t btrfs_feature_visible(struct kobject *kobj, 177510d7360SJeff Mahoney struct attribute *attr, int unused) 178510d7360SJeff Mahoney { 179510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 180510d7360SJeff Mahoney umode_t mode = attr->mode; 181510d7360SJeff Mahoney 182510d7360SJeff Mahoney if (fs_info) { 183510d7360SJeff Mahoney struct btrfs_feature_attr *fa; 184510d7360SJeff Mahoney u64 features; 185510d7360SJeff Mahoney 186510d7360SJeff Mahoney fa = attr_to_btrfs_feature_attr(attr); 187510d7360SJeff Mahoney features = get_features(fs_info, fa->feature_set); 188510d7360SJeff Mahoney 189ba631941SJeff Mahoney if (can_modify_feature(fa)) 190ba631941SJeff Mahoney mode |= S_IWUSR; 191ba631941SJeff Mahoney else if (!(features & fa->feature_bit)) 192510d7360SJeff Mahoney mode = 0; 193510d7360SJeff Mahoney } 194510d7360SJeff Mahoney 195510d7360SJeff Mahoney return mode; 196079b72bcSJeff Mahoney } 197079b72bcSJeff Mahoney 198079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF); 199079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL); 200079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS); 201079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO); 202079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA); 203079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF); 204079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56); 205079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA); 206c736c095SDavid Sterba BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES); 207079b72bcSJeff Mahoney 208079b72bcSJeff Mahoney static struct attribute *btrfs_supported_feature_attrs[] = { 209079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_backref), 210079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(default_subvol), 211079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(mixed_groups), 212079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(compress_lzo), 213079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(big_metadata), 214079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(extended_iref), 215079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(raid56), 216079b72bcSJeff Mahoney BTRFS_FEAT_ATTR_PTR(skinny_metadata), 217c736c095SDavid Sterba BTRFS_FEAT_ATTR_PTR(no_holes), 218079b72bcSJeff Mahoney NULL 219079b72bcSJeff Mahoney }; 220079b72bcSJeff Mahoney 221079b72bcSJeff Mahoney static const struct attribute_group btrfs_feature_attr_group = { 222079b72bcSJeff Mahoney .name = "features", 223510d7360SJeff Mahoney .is_visible = btrfs_feature_visible, 224079b72bcSJeff Mahoney .attrs = btrfs_supported_feature_attrs, 225079b72bcSJeff Mahoney }; 22658176a96SJosef Bacik 2276ab0a202SJeff Mahoney static ssize_t btrfs_show_u64(u64 *value_ptr, spinlock_t *lock, char *buf) 2286ab0a202SJeff Mahoney { 2296ab0a202SJeff Mahoney u64 val; 2306ab0a202SJeff Mahoney if (lock) 2316ab0a202SJeff Mahoney spin_lock(lock); 2326ab0a202SJeff Mahoney val = *value_ptr; 2336ab0a202SJeff Mahoney if (lock) 2346ab0a202SJeff Mahoney spin_unlock(lock); 2356ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2366ab0a202SJeff Mahoney } 2376ab0a202SJeff Mahoney 2386ab0a202SJeff Mahoney static ssize_t global_rsv_size_show(struct kobject *kobj, 2396ab0a202SJeff Mahoney struct kobj_attribute *ka, char *buf) 2406ab0a202SJeff Mahoney { 2416ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2426ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2436ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->size, &block_rsv->lock, buf); 2446ab0a202SJeff Mahoney } 2456ab0a202SJeff Mahoney BTRFS_ATTR(global_rsv_size, 0444, global_rsv_size_show); 2466ab0a202SJeff Mahoney 2476ab0a202SJeff Mahoney static ssize_t global_rsv_reserved_show(struct kobject *kobj, 2486ab0a202SJeff Mahoney struct kobj_attribute *a, char *buf) 2496ab0a202SJeff Mahoney { 2506ab0a202SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj->parent); 2516ab0a202SJeff Mahoney struct btrfs_block_rsv *block_rsv = &fs_info->global_block_rsv; 2526ab0a202SJeff Mahoney return btrfs_show_u64(&block_rsv->reserved, &block_rsv->lock, buf); 2536ab0a202SJeff Mahoney } 2546ab0a202SJeff Mahoney BTRFS_ATTR(global_rsv_reserved, 0444, global_rsv_reserved_show); 2556ab0a202SJeff Mahoney 2566ab0a202SJeff Mahoney #define to_space_info(_kobj) container_of(_kobj, struct btrfs_space_info, kobj) 2576ab0a202SJeff Mahoney 2586ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2596ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf); 2606ab0a202SJeff Mahoney BTRFS_RAID_ATTR(total_bytes, raid_bytes_show); 2616ab0a202SJeff Mahoney BTRFS_RAID_ATTR(used_bytes, raid_bytes_show); 2626ab0a202SJeff Mahoney 2636ab0a202SJeff Mahoney static ssize_t raid_bytes_show(struct kobject *kobj, 2646ab0a202SJeff Mahoney struct kobj_attribute *attr, char *buf) 2656ab0a202SJeff Mahoney 2666ab0a202SJeff Mahoney { 2676ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj->parent); 2686ab0a202SJeff Mahoney struct btrfs_block_group_cache *block_group; 2696ab0a202SJeff Mahoney int index = kobj - sinfo->block_group_kobjs; 2706ab0a202SJeff Mahoney u64 val = 0; 2716ab0a202SJeff Mahoney 2726ab0a202SJeff Mahoney down_read(&sinfo->groups_sem); 2736ab0a202SJeff Mahoney list_for_each_entry(block_group, &sinfo->block_groups[index], list) { 2746ab0a202SJeff Mahoney if (&attr->attr == BTRFS_RAID_ATTR_PTR(total_bytes)) 2756ab0a202SJeff Mahoney val += block_group->key.offset; 2766ab0a202SJeff Mahoney else 2776ab0a202SJeff Mahoney val += btrfs_block_group_used(&block_group->item); 2786ab0a202SJeff Mahoney } 2796ab0a202SJeff Mahoney up_read(&sinfo->groups_sem); 2806ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%llu\n", val); 2816ab0a202SJeff Mahoney } 2826ab0a202SJeff Mahoney 2836ab0a202SJeff Mahoney static struct attribute *raid_attributes[] = { 2846ab0a202SJeff Mahoney BTRFS_RAID_ATTR_PTR(total_bytes), 2856ab0a202SJeff Mahoney BTRFS_RAID_ATTR_PTR(used_bytes), 2866ab0a202SJeff Mahoney NULL 2876ab0a202SJeff Mahoney }; 2886ab0a202SJeff Mahoney 2896ab0a202SJeff Mahoney static void release_raid_kobj(struct kobject *kobj) 2906ab0a202SJeff Mahoney { 2916ab0a202SJeff Mahoney kobject_put(kobj->parent); 2926ab0a202SJeff Mahoney } 2936ab0a202SJeff Mahoney 2946ab0a202SJeff Mahoney struct kobj_type btrfs_raid_ktype = { 2956ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 2966ab0a202SJeff Mahoney .release = release_raid_kobj, 2976ab0a202SJeff Mahoney .default_attrs = raid_attributes, 2986ab0a202SJeff Mahoney }; 2996ab0a202SJeff Mahoney 3006ab0a202SJeff Mahoney #define SPACE_INFO_ATTR(field) \ 3016ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_##field(struct kobject *kobj, \ 3026ab0a202SJeff Mahoney struct kobj_attribute *a, \ 3036ab0a202SJeff Mahoney char *buf) \ 3046ab0a202SJeff Mahoney { \ 3056ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); \ 3066ab0a202SJeff Mahoney return btrfs_show_u64(&sinfo->field, &sinfo->lock, buf); \ 3076ab0a202SJeff Mahoney } \ 3086ab0a202SJeff Mahoney BTRFS_ATTR(field, 0444, btrfs_space_info_show_##field) 3096ab0a202SJeff Mahoney 3106ab0a202SJeff Mahoney static ssize_t btrfs_space_info_show_total_bytes_pinned(struct kobject *kobj, 3116ab0a202SJeff Mahoney struct kobj_attribute *a, 3126ab0a202SJeff Mahoney char *buf) 3136ab0a202SJeff Mahoney { 3146ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3156ab0a202SJeff Mahoney s64 val = percpu_counter_sum(&sinfo->total_bytes_pinned); 3166ab0a202SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%lld\n", val); 3176ab0a202SJeff Mahoney } 3186ab0a202SJeff Mahoney 3196ab0a202SJeff Mahoney SPACE_INFO_ATTR(flags); 3206ab0a202SJeff Mahoney SPACE_INFO_ATTR(total_bytes); 3216ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_used); 3226ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_pinned); 3236ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_reserved); 3246ab0a202SJeff Mahoney SPACE_INFO_ATTR(bytes_may_use); 3256ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_used); 3266ab0a202SJeff Mahoney SPACE_INFO_ATTR(disk_total); 3276ab0a202SJeff Mahoney BTRFS_ATTR(total_bytes_pinned, 0444, btrfs_space_info_show_total_bytes_pinned); 3286ab0a202SJeff Mahoney 3296ab0a202SJeff Mahoney static struct attribute *space_info_attrs[] = { 3306ab0a202SJeff Mahoney BTRFS_ATTR_PTR(flags), 3316ab0a202SJeff Mahoney BTRFS_ATTR_PTR(total_bytes), 3326ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_used), 3336ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_pinned), 3346ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_reserved), 3356ab0a202SJeff Mahoney BTRFS_ATTR_PTR(bytes_may_use), 3366ab0a202SJeff Mahoney BTRFS_ATTR_PTR(disk_used), 3376ab0a202SJeff Mahoney BTRFS_ATTR_PTR(disk_total), 3386ab0a202SJeff Mahoney BTRFS_ATTR_PTR(total_bytes_pinned), 3396ab0a202SJeff Mahoney NULL, 3406ab0a202SJeff Mahoney }; 3416ab0a202SJeff Mahoney 3426ab0a202SJeff Mahoney static void space_info_release(struct kobject *kobj) 3436ab0a202SJeff Mahoney { 3446ab0a202SJeff Mahoney struct btrfs_space_info *sinfo = to_space_info(kobj); 3456ab0a202SJeff Mahoney percpu_counter_destroy(&sinfo->total_bytes_pinned); 3466ab0a202SJeff Mahoney kfree(sinfo); 3476ab0a202SJeff Mahoney } 3486ab0a202SJeff Mahoney 3496ab0a202SJeff Mahoney struct kobj_type space_info_ktype = { 3506ab0a202SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 3516ab0a202SJeff Mahoney .release = space_info_release, 3526ab0a202SJeff Mahoney .default_attrs = space_info_attrs, 3536ab0a202SJeff Mahoney }; 3546ab0a202SJeff Mahoney 3556ab0a202SJeff Mahoney static const struct attribute *allocation_attrs[] = { 3566ab0a202SJeff Mahoney BTRFS_ATTR_PTR(global_rsv_reserved), 3576ab0a202SJeff Mahoney BTRFS_ATTR_PTR(global_rsv_size), 3586ab0a202SJeff Mahoney NULL, 3596ab0a202SJeff Mahoney }; 3606ab0a202SJeff Mahoney 361f8ba9c11SJeff Mahoney static ssize_t btrfs_label_show(struct kobject *kobj, 362f8ba9c11SJeff Mahoney struct kobj_attribute *a, char *buf) 363f8ba9c11SJeff Mahoney { 364f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 365f8ba9c11SJeff Mahoney return snprintf(buf, PAGE_SIZE, "%s\n", fs_info->super_copy->label); 366f8ba9c11SJeff Mahoney } 367f8ba9c11SJeff Mahoney 368f8ba9c11SJeff Mahoney static ssize_t btrfs_label_store(struct kobject *kobj, 369f8ba9c11SJeff Mahoney struct kobj_attribute *a, 370f8ba9c11SJeff Mahoney const char *buf, size_t len) 371f8ba9c11SJeff Mahoney { 372f8ba9c11SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 373f8ba9c11SJeff Mahoney struct btrfs_trans_handle *trans; 374f8ba9c11SJeff Mahoney struct btrfs_root *root = fs_info->fs_root; 375f8ba9c11SJeff Mahoney int ret; 376f8ba9c11SJeff Mahoney 377f8ba9c11SJeff Mahoney if (len >= BTRFS_LABEL_SIZE) { 378efe120a0SFrank Holton pr_err("BTRFS: unable to set label with more than %d bytes\n", 379f8ba9c11SJeff Mahoney BTRFS_LABEL_SIZE - 1); 380f8ba9c11SJeff Mahoney return -EINVAL; 381f8ba9c11SJeff Mahoney } 382f8ba9c11SJeff Mahoney 383f8ba9c11SJeff Mahoney trans = btrfs_start_transaction(root, 0); 384f8ba9c11SJeff Mahoney if (IS_ERR(trans)) 385f8ba9c11SJeff Mahoney return PTR_ERR(trans); 386f8ba9c11SJeff Mahoney 387f8ba9c11SJeff Mahoney spin_lock(&root->fs_info->super_lock); 388f8ba9c11SJeff Mahoney strcpy(fs_info->super_copy->label, buf); 389f8ba9c11SJeff Mahoney spin_unlock(&root->fs_info->super_lock); 390f8ba9c11SJeff Mahoney ret = btrfs_commit_transaction(trans, root); 391f8ba9c11SJeff Mahoney 392f8ba9c11SJeff Mahoney if (!ret) 393f8ba9c11SJeff Mahoney return len; 394f8ba9c11SJeff Mahoney 395f8ba9c11SJeff Mahoney return ret; 396f8ba9c11SJeff Mahoney } 397f8ba9c11SJeff Mahoney BTRFS_ATTR_RW(label, 0644, btrfs_label_show, btrfs_label_store); 398f8ba9c11SJeff Mahoney 399f8ba9c11SJeff Mahoney static struct attribute *btrfs_attrs[] = { 400f8ba9c11SJeff Mahoney BTRFS_ATTR_PTR(label), 401f8ba9c11SJeff Mahoney NULL, 402f8ba9c11SJeff Mahoney }; 403f8ba9c11SJeff Mahoney 404510d7360SJeff Mahoney static void btrfs_release_super_kobj(struct kobject *kobj) 405510d7360SJeff Mahoney { 406510d7360SJeff Mahoney struct btrfs_fs_info *fs_info = to_fs_info(kobj); 407510d7360SJeff Mahoney complete(&fs_info->kobj_unregister); 408510d7360SJeff Mahoney } 409510d7360SJeff Mahoney 410510d7360SJeff Mahoney static struct kobj_type btrfs_ktype = { 411510d7360SJeff Mahoney .sysfs_ops = &kobj_sysfs_ops, 412510d7360SJeff Mahoney .release = btrfs_release_super_kobj, 413f8ba9c11SJeff Mahoney .default_attrs = btrfs_attrs, 414510d7360SJeff Mahoney }; 415510d7360SJeff Mahoney 416510d7360SJeff Mahoney static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj) 417510d7360SJeff Mahoney { 418510d7360SJeff Mahoney if (kobj->ktype != &btrfs_ktype) 419510d7360SJeff Mahoney return NULL; 420510d7360SJeff Mahoney return container_of(kobj, struct btrfs_fs_info, super_kobj); 421510d7360SJeff Mahoney } 42258176a96SJosef Bacik 423e453d989SJeff Mahoney #define NUM_FEATURE_BITS 64 424e453d989SJeff Mahoney static char btrfs_unknown_feature_names[3][NUM_FEATURE_BITS][13]; 425e453d989SJeff Mahoney static struct btrfs_feature_attr btrfs_feature_attrs[3][NUM_FEATURE_BITS]; 426e453d989SJeff Mahoney 427e453d989SJeff Mahoney static u64 supported_feature_masks[3] = { 428e453d989SJeff Mahoney [FEAT_COMPAT] = BTRFS_FEATURE_COMPAT_SUPP, 429e453d989SJeff Mahoney [FEAT_COMPAT_RO] = BTRFS_FEATURE_COMPAT_RO_SUPP, 430e453d989SJeff Mahoney [FEAT_INCOMPAT] = BTRFS_FEATURE_INCOMPAT_SUPP, 431e453d989SJeff Mahoney }; 432e453d989SJeff Mahoney 433e453d989SJeff Mahoney static int addrm_unknown_feature_attrs(struct btrfs_fs_info *fs_info, bool add) 4345ac1d209SJeff Mahoney { 435e453d989SJeff Mahoney int set; 436e453d989SJeff Mahoney 437e453d989SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 438e453d989SJeff Mahoney int i; 439e453d989SJeff Mahoney struct attribute *attrs[2]; 440e453d989SJeff Mahoney struct attribute_group agroup = { 441e453d989SJeff Mahoney .name = "features", 442e453d989SJeff Mahoney .attrs = attrs, 443e453d989SJeff Mahoney }; 444e453d989SJeff Mahoney u64 features = get_features(fs_info, set); 445e453d989SJeff Mahoney features &= ~supported_feature_masks[set]; 446e453d989SJeff Mahoney 447e453d989SJeff Mahoney if (!features) 448e453d989SJeff Mahoney continue; 449e453d989SJeff Mahoney 450e453d989SJeff Mahoney attrs[1] = NULL; 451e453d989SJeff Mahoney for (i = 0; i < NUM_FEATURE_BITS; i++) { 452e453d989SJeff Mahoney struct btrfs_feature_attr *fa; 453e453d989SJeff Mahoney 454e453d989SJeff Mahoney if (!(features & (1ULL << i))) 455e453d989SJeff Mahoney continue; 456e453d989SJeff Mahoney 457e453d989SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 458e453d989SJeff Mahoney attrs[0] = &fa->kobj_attr.attr; 459e453d989SJeff Mahoney if (add) { 460e453d989SJeff Mahoney int ret; 461e453d989SJeff Mahoney ret = sysfs_merge_group(&fs_info->super_kobj, 462e453d989SJeff Mahoney &agroup); 463e453d989SJeff Mahoney if (ret) 464e453d989SJeff Mahoney return ret; 465e453d989SJeff Mahoney } else 466e453d989SJeff Mahoney sysfs_unmerge_group(&fs_info->super_kobj, 467e453d989SJeff Mahoney &agroup); 468e453d989SJeff Mahoney } 469e453d989SJeff Mahoney 470e453d989SJeff Mahoney } 471e453d989SJeff Mahoney return 0; 472e453d989SJeff Mahoney } 473e453d989SJeff Mahoney 474e453d989SJeff Mahoney static void __btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) 475e453d989SJeff Mahoney { 4765ac1d209SJeff Mahoney kobject_del(&fs_info->super_kobj); 4775ac1d209SJeff Mahoney kobject_put(&fs_info->super_kobj); 4785ac1d209SJeff Mahoney wait_for_completion(&fs_info->kobj_unregister); 4795ac1d209SJeff Mahoney } 4805ac1d209SJeff Mahoney 481e453d989SJeff Mahoney void btrfs_sysfs_remove_one(struct btrfs_fs_info *fs_info) 482e453d989SJeff Mahoney { 483e453d989SJeff Mahoney if (fs_info->space_info_kobj) { 484e453d989SJeff Mahoney sysfs_remove_files(fs_info->space_info_kobj, allocation_attrs); 485e453d989SJeff Mahoney kobject_del(fs_info->space_info_kobj); 486e453d989SJeff Mahoney kobject_put(fs_info->space_info_kobj); 487e453d989SJeff Mahoney } 488e453d989SJeff Mahoney kobject_del(fs_info->device_dir_kobj); 489e453d989SJeff Mahoney kobject_put(fs_info->device_dir_kobj); 490e453d989SJeff Mahoney addrm_unknown_feature_attrs(fs_info, false); 491e453d989SJeff Mahoney sysfs_remove_group(&fs_info->super_kobj, &btrfs_feature_attr_group); 492e453d989SJeff Mahoney __btrfs_sysfs_remove_one(fs_info); 493e453d989SJeff Mahoney } 494e453d989SJeff Mahoney 49579da4fa4SJeff Mahoney const char * const btrfs_feature_set_names[3] = { 49679da4fa4SJeff Mahoney [FEAT_COMPAT] = "compat", 49779da4fa4SJeff Mahoney [FEAT_COMPAT_RO] = "compat_ro", 49879da4fa4SJeff Mahoney [FEAT_INCOMPAT] = "incompat", 49979da4fa4SJeff Mahoney }; 50079da4fa4SJeff Mahoney 5013b02a68aSJeff Mahoney char *btrfs_printable_features(enum btrfs_feature_set set, u64 flags) 5023b02a68aSJeff Mahoney { 5033b02a68aSJeff Mahoney size_t bufsize = 4096; /* safe max, 64 names * 64 bytes */ 5043b02a68aSJeff Mahoney int len = 0; 5053b02a68aSJeff Mahoney int i; 5063b02a68aSJeff Mahoney char *str; 5073b02a68aSJeff Mahoney 5083b02a68aSJeff Mahoney str = kmalloc(bufsize, GFP_KERNEL); 5093b02a68aSJeff Mahoney if (!str) 5103b02a68aSJeff Mahoney return str; 5113b02a68aSJeff Mahoney 5123b02a68aSJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 5133b02a68aSJeff Mahoney const char *name; 5143b02a68aSJeff Mahoney 5153b02a68aSJeff Mahoney if (!(flags & (1ULL << i))) 5163b02a68aSJeff Mahoney continue; 5173b02a68aSJeff Mahoney 5183b02a68aSJeff Mahoney name = btrfs_feature_attrs[set][i].kobj_attr.attr.name; 5193b02a68aSJeff Mahoney len += snprintf(str + len, bufsize - len, "%s%s", 5203b02a68aSJeff Mahoney len ? "," : "", name); 5213b02a68aSJeff Mahoney } 5223b02a68aSJeff Mahoney 5233b02a68aSJeff Mahoney return str; 5243b02a68aSJeff Mahoney } 5253b02a68aSJeff Mahoney 52679da4fa4SJeff Mahoney static void init_feature_attrs(void) 52779da4fa4SJeff Mahoney { 52879da4fa4SJeff Mahoney struct btrfs_feature_attr *fa; 52979da4fa4SJeff Mahoney int set, i; 53079da4fa4SJeff Mahoney 53179da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names) != 53279da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs)); 53379da4fa4SJeff Mahoney BUILD_BUG_ON(ARRAY_SIZE(btrfs_unknown_feature_names[0]) != 53479da4fa4SJeff Mahoney ARRAY_SIZE(btrfs_feature_attrs[0])); 53579da4fa4SJeff Mahoney 5363b02a68aSJeff Mahoney memset(btrfs_feature_attrs, 0, sizeof(btrfs_feature_attrs)); 5373b02a68aSJeff Mahoney memset(btrfs_unknown_feature_names, 0, 5383b02a68aSJeff Mahoney sizeof(btrfs_unknown_feature_names)); 5393b02a68aSJeff Mahoney 54079da4fa4SJeff Mahoney for (i = 0; btrfs_supported_feature_attrs[i]; i++) { 54179da4fa4SJeff Mahoney struct btrfs_feature_attr *sfa; 54279da4fa4SJeff Mahoney struct attribute *a = btrfs_supported_feature_attrs[i]; 5433b02a68aSJeff Mahoney int bit; 54479da4fa4SJeff Mahoney sfa = attr_to_btrfs_feature_attr(a); 5453b02a68aSJeff Mahoney bit = ilog2(sfa->feature_bit); 5463b02a68aSJeff Mahoney fa = &btrfs_feature_attrs[sfa->feature_set][bit]; 54779da4fa4SJeff Mahoney 54879da4fa4SJeff Mahoney fa->kobj_attr.attr.name = sfa->kobj_attr.attr.name; 54979da4fa4SJeff Mahoney } 55079da4fa4SJeff Mahoney 55179da4fa4SJeff Mahoney for (set = 0; set < FEAT_MAX; set++) { 55279da4fa4SJeff Mahoney for (i = 0; i < ARRAY_SIZE(btrfs_feature_attrs[set]); i++) { 55379da4fa4SJeff Mahoney char *name = btrfs_unknown_feature_names[set][i]; 55479da4fa4SJeff Mahoney fa = &btrfs_feature_attrs[set][i]; 55579da4fa4SJeff Mahoney 55679da4fa4SJeff Mahoney if (fa->kobj_attr.attr.name) 55779da4fa4SJeff Mahoney continue; 55879da4fa4SJeff Mahoney 55979da4fa4SJeff Mahoney snprintf(name, 13, "%s:%u", 56079da4fa4SJeff Mahoney btrfs_feature_set_names[set], i); 56179da4fa4SJeff Mahoney 56279da4fa4SJeff Mahoney fa->kobj_attr.attr.name = name; 56379da4fa4SJeff Mahoney fa->kobj_attr.attr.mode = S_IRUGO; 56479da4fa4SJeff Mahoney fa->feature_set = set; 56579da4fa4SJeff Mahoney fa->feature_bit = 1ULL << i; 56679da4fa4SJeff Mahoney } 56779da4fa4SJeff Mahoney } 56879da4fa4SJeff Mahoney } 56979da4fa4SJeff Mahoney 57029e5be24SJeff Mahoney static int add_device_membership(struct btrfs_fs_info *fs_info) 57129e5be24SJeff Mahoney { 57229e5be24SJeff Mahoney int error = 0; 57329e5be24SJeff Mahoney struct btrfs_fs_devices *fs_devices = fs_info->fs_devices; 57429e5be24SJeff Mahoney struct btrfs_device *dev; 57529e5be24SJeff Mahoney 57629e5be24SJeff Mahoney fs_info->device_dir_kobj = kobject_create_and_add("devices", 57729e5be24SJeff Mahoney &fs_info->super_kobj); 57829e5be24SJeff Mahoney if (!fs_info->device_dir_kobj) 57929e5be24SJeff Mahoney return -ENOMEM; 58029e5be24SJeff Mahoney 58129e5be24SJeff Mahoney list_for_each_entry(dev, &fs_devices->devices, dev_list) { 582f085381eSAnand Jain struct hd_struct *disk; 583f085381eSAnand Jain struct kobject *disk_kobj; 584f085381eSAnand Jain 585f085381eSAnand Jain if (!dev->bdev) 586f085381eSAnand Jain continue; 587f085381eSAnand Jain 588f085381eSAnand Jain disk = dev->bdev->bd_part; 589f085381eSAnand Jain disk_kobj = &part_to_dev(disk)->kobj; 59029e5be24SJeff Mahoney 59129e5be24SJeff Mahoney error = sysfs_create_link(fs_info->device_dir_kobj, 59229e5be24SJeff Mahoney disk_kobj, disk_kobj->name); 59329e5be24SJeff Mahoney if (error) 59429e5be24SJeff Mahoney break; 59529e5be24SJeff Mahoney } 59629e5be24SJeff Mahoney 59729e5be24SJeff Mahoney return error; 59829e5be24SJeff Mahoney } 59929e5be24SJeff Mahoney 600510d7360SJeff Mahoney /* /sys/fs/btrfs/ entry */ 601510d7360SJeff Mahoney static struct kset *btrfs_kset; 602510d7360SJeff Mahoney 6031bae3098SDavid Sterba /* /sys/kernel/debug/btrfs */ 6041bae3098SDavid Sterba static struct dentry *btrfs_debugfs_root_dentry; 6051bae3098SDavid Sterba 6061bae3098SDavid Sterba /* Debugging tunables and exported data */ 6071bae3098SDavid Sterba u64 btrfs_debugfs_test; 6081bae3098SDavid Sterba 6095ac1d209SJeff Mahoney int btrfs_sysfs_add_one(struct btrfs_fs_info *fs_info) 6105ac1d209SJeff Mahoney { 6115ac1d209SJeff Mahoney int error; 6125ac1d209SJeff Mahoney 6135ac1d209SJeff Mahoney init_completion(&fs_info->kobj_unregister); 614510d7360SJeff Mahoney fs_info->super_kobj.kset = btrfs_kset; 6155ac1d209SJeff Mahoney error = kobject_init_and_add(&fs_info->super_kobj, &btrfs_ktype, NULL, 6165ac1d209SJeff Mahoney "%pU", fs_info->fsid); 617e453d989SJeff Mahoney if (error) 618e453d989SJeff Mahoney return error; 619510d7360SJeff Mahoney 620510d7360SJeff Mahoney error = sysfs_create_group(&fs_info->super_kobj, 621510d7360SJeff Mahoney &btrfs_feature_attr_group); 622e453d989SJeff Mahoney if (error) { 623e453d989SJeff Mahoney __btrfs_sysfs_remove_one(fs_info); 624e453d989SJeff Mahoney return error; 625e453d989SJeff Mahoney } 62679da4fa4SJeff Mahoney 627e453d989SJeff Mahoney error = addrm_unknown_feature_attrs(fs_info, true); 62879da4fa4SJeff Mahoney if (error) 62979da4fa4SJeff Mahoney goto failure; 63079da4fa4SJeff Mahoney 63129e5be24SJeff Mahoney error = add_device_membership(fs_info); 63229e5be24SJeff Mahoney if (error) 63329e5be24SJeff Mahoney goto failure; 63429e5be24SJeff Mahoney 6356ab0a202SJeff Mahoney fs_info->space_info_kobj = kobject_create_and_add("allocation", 6366ab0a202SJeff Mahoney &fs_info->super_kobj); 6376ab0a202SJeff Mahoney if (!fs_info->space_info_kobj) { 6386ab0a202SJeff Mahoney error = -ENOMEM; 6396ab0a202SJeff Mahoney goto failure; 6406ab0a202SJeff Mahoney } 6416ab0a202SJeff Mahoney 6426ab0a202SJeff Mahoney error = sysfs_create_files(fs_info->space_info_kobj, allocation_attrs); 6436ab0a202SJeff Mahoney if (error) 6446ab0a202SJeff Mahoney goto failure; 6456ab0a202SJeff Mahoney 64679da4fa4SJeff Mahoney return 0; 64779da4fa4SJeff Mahoney failure: 648510d7360SJeff Mahoney btrfs_sysfs_remove_one(fs_info); 6495ac1d209SJeff Mahoney return error; 6505ac1d209SJeff Mahoney } 6515ac1d209SJeff Mahoney 6521bae3098SDavid Sterba static int btrfs_init_debugfs(void) 6531bae3098SDavid Sterba { 6541bae3098SDavid Sterba #ifdef CONFIG_DEBUG_FS 6551bae3098SDavid Sterba btrfs_debugfs_root_dentry = debugfs_create_dir("btrfs", NULL); 6561bae3098SDavid Sterba if (!btrfs_debugfs_root_dentry) 6571bae3098SDavid Sterba return -ENOMEM; 6581bae3098SDavid Sterba 6591bae3098SDavid Sterba debugfs_create_u64("test", S_IRUGO | S_IWUGO, btrfs_debugfs_root_dentry, 6601bae3098SDavid Sterba &btrfs_debugfs_test); 6611bae3098SDavid Sterba #endif 6621bae3098SDavid Sterba return 0; 6631bae3098SDavid Sterba } 6641bae3098SDavid Sterba 665b214107eSChristoph Hellwig int btrfs_init_sysfs(void) 66658176a96SJosef Bacik { 667079b72bcSJeff Mahoney int ret; 6681bae3098SDavid Sterba 669e3fe4e71SGreg KH btrfs_kset = kset_create_and_add("btrfs", NULL, fs_kobj); 670e3fe4e71SGreg KH if (!btrfs_kset) 671e3fe4e71SGreg KH return -ENOMEM; 672079b72bcSJeff Mahoney 6731bae3098SDavid Sterba ret = btrfs_init_debugfs(); 6741bae3098SDavid Sterba if (ret) 675079b72bcSJeff Mahoney return ret; 676079b72bcSJeff Mahoney 6771bae3098SDavid Sterba init_feature_attrs(); 6781bae3098SDavid Sterba ret = sysfs_create_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 6791bae3098SDavid Sterba 6801bae3098SDavid Sterba return ret; 68158176a96SJosef Bacik } 68258176a96SJosef Bacik 683b214107eSChristoph Hellwig void btrfs_exit_sysfs(void) 68458176a96SJosef Bacik { 685079b72bcSJeff Mahoney sysfs_remove_group(&btrfs_kset->kobj, &btrfs_feature_attr_group); 686e3fe4e71SGreg KH kset_unregister(btrfs_kset); 6871bae3098SDavid Sterba debugfs_remove_recursive(btrfs_debugfs_root_dentry); 68858176a96SJosef Bacik } 68955d47414SChris Mason 690